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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81426 91177308-0d34-0410-b5e6-96231b3b80d8
87 lines
3.4 KiB
C++
87 lines
3.4 KiB
C++
//===- llvm/Analysis/MallocHelper.h ---- Identify malloc calls --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This family of functions identifies calls to malloc, bitcasts of malloc
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// calls, and the types and array sizes associated with them.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_MALLOCHELPER_H
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#define LLVM_ANALYSIS_MALLOCHELPER_H
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namespace llvm {
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class BitCastInst;
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class CallInst;
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class Instruction;
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class PointerType;
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class Twine;
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class Type;
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class Value;
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//===----------------------------------------------------------------------===//
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// malloc Call Utility Functions.
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//
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/// isMalloc - Returns true if the the value is either a malloc call or a
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/// bitcast of the result of a malloc call
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bool isMalloc(const Value* I);
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bool isMalloc(Value* I);
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/// extractMallocCall - Returns the corresponding CallInst if the instruction
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/// is a malloc call. Since CallInst::CreateMalloc() only creates calls, we
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/// ignore InvokeInst here.
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const CallInst* extractMallocCall(const Value* I);
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CallInst* extractMallocCall(Value* I);
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/// extractMallocCallFromBitCast - Returns the corresponding CallInst if the
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/// instruction is a bitcast of the result of a malloc call.
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const CallInst* extractMallocCallFromBitCast(const Value* I);
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CallInst* extractMallocCallFromBitCast(Value* I);
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/// isArrayMalloc - Returns the corresponding CallInst if the instruction
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/// matches the malloc call IR generated by CallInst::CreateMalloc(). This
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/// means that it is a malloc call with one bitcast use AND the malloc call's
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/// size argument is:
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/// 1. a constant not equal to the malloc's allocated type
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/// or
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/// 2. the result of a multiplication by the malloc's allocated type
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/// Otherwise it returns NULL.
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/// The unique bitcast is needed to determine the type/size of the array
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/// allocation.
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CallInst* isArrayMalloc(Value* I);
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const CallInst* isArrayMalloc(const Value* I);
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/// getMallocType - Returns the PointerType resulting from the malloc call.
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/// This PointerType is the result type of the call's only bitcast use.
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/// If there is no unique bitcast use, then return NULL.
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const PointerType* getMallocType(const CallInst* CI);
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/// getMallocAllocatedType - Returns the Type allocated by malloc call. This
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/// Type is the result type of the call's only bitcast use. If there is no
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/// unique bitcast use, then return NULL.
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const Type* getMallocAllocatedType(const CallInst* CI);
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/// getMallocArraySize - Returns the array size of a malloc call. The array
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/// size is computated in 1 of 3 ways:
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/// 1. If the element type if of size 1, then array size is the argument to
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/// malloc.
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/// 2. Else if the malloc's argument is a constant, the array size is that
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/// argument divided by the element type's size.
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/// 3. Else the malloc argument must be a multiplication and the array size is
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/// the first operand of the multiplication.
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/// This function returns constant 1 if:
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/// 1. The malloc call's allocated type cannot be determined.
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/// 2. IR wasn't created by a call to CallInst::CreateMalloc() with a non-NULL
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/// ArraySize.
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Value* getMallocArraySize(CallInst* CI);
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} // End llvm namespace
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#endif
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